<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert title="注意,前方高能,只能为第三级列表设置参数" type="warning" show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_top">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 级联选择框 -->
          <el-cascader expand-trigger="hover" v-model="selectedCateKeys" :options="catelist" :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand"></el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template>
                <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i">{{}}</el-tag>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template>
                <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="EditDialogVisible" width="50%" @close="EditDialogClosed">
      <!-- 修改参数的对话框 -->
      <el-form ref="EditFormRef" :model="EditForm" label-width="100px" :rules="EditFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="EditForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="EditDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="EditParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableDate: [],
      // 静态参数的数据
      onlyTableDate: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      },
      // 这是控制修改对话框的显示与隐藏
      EditDialogVisible: false,
      // 修改的表单数据对象
      EditForm: {},
      // 修改表单的验证规则对象
      EditFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      }
    }
  },
  methods: {
    // 获取所有的商品分类函数
    async getCateList() {
      const {
        data: res
      } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.catelist = res.data
      this.$message.success('获取分类数据成功!')
      console.log(this.catelist)
    },
    // 级联选择框选中项会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // Tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectedCateKeys)
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        return 0
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的ID,和当前所处的面板,获取对应的参数
      const {
        data: res
      } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      // 循环拿到携带的标签
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals.split(' ')
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      } else {
        this.onlyTableDate = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按妞添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const {
          data: res
        } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功!')
        // 关闭添加对话框
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮,展示修改的对话框
    async showEditDialog(attrid) {
      // 查询当前参数的信息
      const {
        data: res
      } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, {
        params: {
          attr_sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.EditForm = res.data
      this.EditDialogVisible = true
    },
    // 重置修改的表单
    EditDialogClosed() {
      this.$refs.EditFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    EditParams() {
      this.$refs.EditFormRef.validate(async valid => {
        if (!valid) return
        const {
          data: res
        } = await this.$http.put(`categories/${this.cateId}/attributes/${this.EditForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        this.$message.success('修改参数成功!')
        this.getParamsDate()
        this.EditDialogVisible = false
      })
    }
  },
  created() {
    // 获取所有的商品分类函数
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用,返回true,反之
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName !== 'many') {
        return '静态属性'
      } else {
        return '动态参数'
      }
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_top {
    margin-top: 15px;
  }

  .el-cascader {
    margin-left: 15px;
  }
</style>
